polynomial calculations over Z/Zp (for prime p)?

[Alberto Candel]

Hi,
What are the CAS settings for this to work? For example, quo() is documented in the xcas manual (2.25.3), but I cannot get it to work in the HP prime:
quo( (x^3+3x)%5,(2x^2+6x-5)%5)
should output -2x+1 but I get an error. Same if % is replaced by MOD (or mod). In fact, the HP prime example in the Help for MOD is 9 mod 5 results in an error. Maybe my CAS settings are wrong.